中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.022 seconds)

    MAGNETIC RECORDING CARRIER
    9.
    发明专利
    MAGNETIC RECORDING CARRIER 失效

    公开(公告)号：JPH01102729A

    公开(公告)日：1989-04-20

    申请号：JP22892188

    申请日：1988-09-14

    Applicant: BASF AG

    Inventor： IEENE KOFUAKUSU ,  MIRENA MERUTSUAA ,  BUERUNAA BARUTSU ,  BUERUNAA RENTSU ,  BUERUNAA ROTSUHO ,  HERUMUUTO YAKUSHIYU

    IPC: G11B5/706 ,  C09D5/23 ,  C09D7/12 ,  C09D167/00 ,  C09D177/00 ,  C09D183/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/708 ,  G11B5/71

    Abstract: PURPOSE: To improve S/N and durability by incorporating specific particulate nonmagnetic metal oxides, lubricants and a comb-shaped block copolymer as a dispersant at restricted ratios into particulate magnetic materials having a specified specific surface area. CONSTITUTION: This magnetic recording carrier contains at least one kind of the particulate nomnagnetic metal oxides having Mohs hardness larger than 5 and the specific surface area based on BET of at least 2m /g at a ratio of 1 to 20wt.% of the weight of at least one kind of particulate magnetic materials having the specific surface area based on BET of at least 25m /g, at least one kind of the lubricants selected from a group consisting of silicone resins, polyethylene wax and metal salts of paraffin, etc., at a ratio of 1 to 10wt.% and the comb-shaped block copolymer consisting of a polyethylene imine chain having a mol.wt. of at least 2000 as a base and having a polyamide and/or polyester side chain having a mol.wt. of at least 500 at a ratio of 1 to 20wt.%. As a result, the S/N and the resistivity to the wear of the layer surface are improved.

Patent Agency Ranking